Model CRF450RX ENGINE   Type 449.7cc liquid-cooled single-cylinder four-stroke Valve Train Unicam® OHC, four-valve; 10.0mm intake, steel; 8.8mm exhaust, steel Bore x Stroke 96.0mm x 62.1mm Compression Ratio 13.5:1 Induction Programmed fuel-injection system (PGM-FI); 46mm throttle bore Ignition Full transistorized  Starter Electric Driveline #520 chain; 13T/50T  Transmission Constant-mesh 5-speed return; manual Clutch Multiplate wet (6 springs) SUSPENSION   Front 49mm fully adjustable leading-axle inverted telescopic Showa coil-spring fork; 12.0 in. travel Rear Pro-Link system; fully adjustable Showa single shock; 12.3 in. travel BRAKES   Front Single 260mm hydraulic disc Rear Single 240mm hydraulic disc TIRES   Front Dunlop Geomax AT81 90/90-21 w/ tube Rear Dunlop Geomax AT81 120/90-18 w/ tube MEASUREMENTS   Rake (castor angle) 27°22’  Trail 116mm (4.6 in.)  Length 85.9 in. Width 32.5 in. Height 50.2 in. Seat Height 37.8 in. Ground Clearance  12.9 in. Wheelbase 58.1 in. Fuel Capacity 2.2 gal. Curb Weight* 257 lbs. OTHER   Colors Red *Includes all standard equipment, required fluids and full tank of fuel—ready to ride Meets current CARB and EPA off-road emissions standards